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Experimental Verification of Decoherence-Free Subspaces

Kwiat, Paul G. and Berglund, Andrew J. and Altepeter, Joseph B. and White, Andrew G. (2000) Experimental Verification of Decoherence-Free Subspaces. Science, 290 (5491). pp. 498-501. ISSN 0036-8075. doi:10.1126/science.290.5491.498.

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Using spontaneous parametric down-conversion, we produce polarization-entangled states of two photons and characterize them using two-photon tomography to measure the density matrix. A controllable decoherence is imposed on the states by passing the photons through thick, adjustable birefringent elements. When the system is subject to collective decoherence, one particular entangled state is seen to be decoherence-free, as predicted by theory. Such decoherence-free systems may have an important role for the future of quantum computation and information processing.

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Additional Information:© 2000 American Association for the Advancement of Science. Received 13 June 2000; accepted 29 August 2000. We thank S. Barraza-Lopez and D. James for assistance and D. Lidar and L. Viola for valuable discussions. This work was supported in part by the National Security Agency and Advanced Research and Development Activity (ARDA) under contract MOD-713700.
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National Security Agency (NSA)UNSPECIFIED
Advanced Research and Development Activity (ARDA)MOD-713700
Issue or Number:5491
Record Number:CaltechAUTHORS:20141112-110548640
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51649
Deposited By: Tony Diaz
Deposited On:12 Nov 2014 21:39
Last Modified:10 Nov 2021 19:13

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